Vinylogous Elimination/C–H Functionalization/Allylation Cascade Reaction of Allenoate Adducts: Synthesis of Ring-Fused Dihydropyridinones
作者:Manman Sun、Weida Chen、Haijian Wu、Xiangyu Xia、Jianguo Yang、Lei Wang、Guodong Shen、Zhiming Wang
DOI:10.1021/acs.orglett.0c02956
日期:2020.11.6
A palladium-catalyzed cascade reaction of β′-allenoate adducts with aryl/heteroaryl carboxamides through a vinylogouselimination/C–H functionalization/intramolecular allylation reaction sequence has been developed with high Z stereoselectivity. Various ring-fused dihydropyridinones bearing an α,β-unsaturated ester substituent are obtained. It is the first example of application of the allenoate adducts
Asymmetric Palladium-Catalyzed C–H Functionalization Cascade for Synthesis of Chiral 3,4-Dihydroisoquinolones
作者:Manman Sun、Haijian Wu、Xiangyu Xia、Weida Chen、Zhiming Wang、Jianguo Yang
DOI:10.1021/acs.joc.9b01372
日期:2019.10.18
A palladium-catalyzed C-H functionalization/intramolecular asymmetric allylation cascade of N-sulfonyl benzamides with 1,3-dienes has been developed. In the presence of a chiral pyridine-oxazoline ligand, this protocol enables the synthesis of chiral 3,4-dihydroisoquinolones in yields of up to 83% with enantioselectivities of up to 96%, using environmentally friendly air as the terminal oxidant.
Revised pKa scale, containing 231 acids and spanning almost 30 orders of magnitude of acidities in acetonitrile, one of the most useful solvents for non‐aqueous acid‐base chemistry, is presented.